I never heard anyone say. We started with Ameraucanas in March 1999 with day old chicks from John Blehm and Duane Urch. September 25, 1999 we purchased our start of wheaten and blue wheaten from Wayne Meredith at his place. We were at our first show in Belvidere, Ill. which was only a short drive South of Wayne's.
The reason John crossed the whites into his blacks was to attempt to improve the blacks egg color which had decreased due to crossing the black Ameraucanas with Australorps which was done in an attempt to improve their quality.
We started at the time this cross was being done. A few of our black chicks turned out to have single combs. They were not used as breeders. One pen that we started with laid excellent blue eggs-the best we ever had. Those pullets most likely didn't have any Australorp in them. The whole pen was very flighty. Anytime someone or something past by they would jump in the air. This damaged the tips of their tail and wing feathers causing them to be white. Unknowing, that a damaged feather in its infant stage will leak its color causing it to be white, we sold the black hens to someone to butcher.
If white tips appear on wing main feathers-symmetrically on the two wings one can bet that it is genetic rather than from an injury. Its normal for the black and blue chicks to have white feathers in their wings. This needs to molt out and their adult feathers need to free from the white.